All the heat generated in a 5\(\Omega\) resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
A
120J
B
60Jg-1
C
120Jg-1
D
1500J
E
1500Jg-1
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Heat energy = electrical energy
mL = I2Rt
5 x L = 2 x 2 x 5 x 30
L = 120Jg-1
Source: Myschool Past Questions Archive (Record #28685)